On certain seeds, underground structures like caves and lava pools repeat in really strange ways infinitely along one coordinate axis.
Steps to Reproduce:
1. Create a new world with the seed 254395090403385.
2. Go into spectator mode and fly into the ground. Give yourself Night Vision to see the caves easier.
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Tested it again with 20w29a and the issue is still present.

Duplicate of MC-111378.
this has been a thing for a while and WOW these seeds are rare!